Lower rim-modified calix[4]arenes with fragments of EDTA (DTPA) and their Ln(III) complexes (Ln = Yb, Lu): synthesis and NIR-luminescent properties

Abstract

Derivatives o f p- tert-butylcalix[4]arene substituted on the lower rim with fragments of aminopolycarboxylic acids (EDTA, DTPA) were obtained. Mono and binuclear com-ple xes w it h la nt ha nide ( III ) io ns we re s ynt hes ized us ing t hese co mpo unds. T he e ffe ct o f the number and type of aminopolycarboxylic acid fragments on the luminescence of lig-ands a nd complexes was studied. The influence of the distance between the emitting ion and the calixarene macrocycle on the intensity of 4f- luminescence was analyzed.